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Symbols Characteristics
A Regular aluminum oxide, is used for general purposes of mild steel, cast-iron etc.
WA White aluminum oxide, is used for light grinding of all kinds, particularly on hard, heat-sensitive steels.
C Black silicon carbide. Used for grinding gray iron, nonferrous metals and nonmetallic materials such as glass, rubber, stones etc.
GC Green silicon carbide, is well suited for special alloy grinding such as tungsten carbide, cold-rolled steels, sapphire, glass, gem and granite.
RA, PA Pink aluminum oxide, is suitable for tool grinding and surface grinding.
SA, MA, 32A Strong sharp monocrystaline aluminum oxide. It is particularly suitable for grinding all kinds of tool steels.
AZ A modified high zirconia aluminum oxide, used in foundries snagging cast iron and steels for heavy duty work.
Coarse Medium Fine Very Fine Ultra Fine
10 12 14
16 20 24
30 36 46
54 60
70 80 90 100
120 150 180 220
240 280 320 400
500 600 700 800
1000 1200 1500
2500 3000 4000
Very Soft Soft Medium Hard Very Hard
Symbol No. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Abrasive Ratio % 62 60 58 56 54 52 50 48 46 44 42 40 38 36 34
Symbols Characteristics
Most common bond for precision grinding porosity and strength of the wheels made with this bond give high stock removal along with their rigidity helping to attain high precision. Not affected by water, acid, oils or ordinary temperature variations.
Used for wheels in fabrication shops, foundries, billet shops, sharpening and gumming saws, and in many precision applications. These wheels excel in rapid stock removal as well as in applications requiring better finishes. This bond is also restricted to reinforced resinoid products, cut-off wheels, or specially formulated products.
Used for most centerless feed wheels, precision ball race grinding wheels, and for snagging with portable grinders. Used where finish is important and for cut-off wheels where burr and burn must be held to a minimum.
A notable bond used for cutlery or particularly thin workpiece, marble surface grinding and superfinishing.